pmSystems: 3-way switch handling

Hi Folks,

I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have a
question for cockpit builders.

For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
(OFF-AUTO-ON) how do you typically wire these? Do you have toggle switches

for which there are 3 active poles and a common ground or do you use an SPDT

switch (center off)?

I need to know how I should program for these functions. The first case is

simply 3 different functions and each position is mapped to its own
function. The second one requires logic that recognizes that a toggle to
"off" signifies the center function (which is usually not "off" but "auto"
or "on" ).

So I need to get an idea of what most people are doing in order to code the

most popular solution.

Thanks!

Scott L. Fausel, VMD
Integrated Flight Systems
http://www.iflightsystems.com

Hi,

> I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have
a
> question for cockpit builders.

Damn! Send photos! ;-)

> For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
> (OFF-AUTO-ON) how do you typically wire these? Do you have toggle
> switches
> for which there are 3 active poles and a common ground or do you use an
> SPDT
> switch (center off)?

We might need to add a timer-controlled bit for that... there are not many
switches like that and it shouldn't be too difficult to add.

Ciao

Enrico

"Enrico Schiratti" wrote in message
news:273677.54362@wb.onvix.com...
> Hi,
>
>> I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have
> a
>> question for cockpit builders.
>
> Damn! Send photos! ;-)

If only I meant my own cockpit - afraid I'm talking about the software
for my interface system :-)

>
>> For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
>> (OFF-AUTO-ON) how do you typically wire these? Do you have toggle
>> switches
>> for which there are 3 active poles and a common ground or do you use an
>> SPDT
>> switch (center off)?
>
> We might need to add a timer-controlled bit for that... there are not
many
> switches like that and it shouldn't be too difficult to add.

I've tentatively programmed these as if they are a standard center-off SPDT

switch. Each "on" position is mapped to a different input. The functions
for these inputs detect a toggle and then branch based upon "toggle on" or
"toggle off." I just make "toggle off" for both of the ports the center
function, whatever it is e.g. "Auto." I think this will be the simplest
solution and you get 3 positions for the price of 2 .

A timer controlled bit for spring-loaded positions would be good in case
people forget to toggle back with a standard switch.

Thanks,

-Scott

On Wed, 01 Dec 2004 23:28:47 EST, Scott
Fausel wrote:

>Hi Folks,
>
>I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have a

>question for cockpit builders.
>
>For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
>(OFF-AUTO-ON) how do you typically wire these? Do you have toggle switches

>for which there are 3 active poles and a common ground or do you use an SPDT

>switch (center off)?

Hi Scott
You need to use a DPDT toggle switch that has a On - On - On
configuration

They can be wired:

on - off - on
on - on - off
off - on - on
on - on - on

David
www.737FlightSim.com

Hi Scott
I forgot to provide a part number :-(
MS27407-4 or Microswitch 2TL1-10 will give you a idea how the are
wired.

David
www.737FlightSim.com

On Thu, 02 Dec 2004 16:57:19 EST, David Allen
wrote:

>On Wed, 01 Dec 2004 23:28:47 EST, Scott
>Fausel wrote:
>
>>Hi Folks,
>>
>>I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have a

>
>>question for cockpit builders.
>>
>>For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
>>(OFF-AUTO-ON) how do you typically wire these? Do you have toggle switches

>
>>for which there are 3 active poles and a common ground or do you use an
SPDT
>
>>switch (center off)?
>
>Hi Scott
>You need to use a DPDT toggle switch that has a On - On - On
>configuration
>
>They can be wired:
>
>on - off - on
>on - on - off
>off - on - on
>on - on - on
>
>David
>www.737FlightSim.com